classdropdownlist.ascx.cs

本在线考试系统采用了面向对象的分析和设计

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using ExaminationSystem.BLL.Service;
using ExaminationSystem.BLL.Domain;

public partial class UserControls_ClassDropDownList : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BindClass();
        }
    }
    public override void DataBind()
    {
        base.DataBind();
        BindClass();
    }
    public void BindClass()
    {
        DropDownList1.DataSource =new  ClassService().GetAll();
        DropDownList1.DataTextField = "Name";
        DropDownList1.DataValueField = "ID";
        DropDownList1.DataBind();
    }
    public void SetSelectedClass(Class cs)
    {
        foreach (ListItem item in DropDownList1.Items)
        {
            if (item.Value == cs.ID.ToString())
                item.Selected = true;
        }
    }
    public Class SelectedClass
    {
        get {
            if (DropDownList1.SelectedValue == "")
                return new Class();
            return new ClassService().GetById(long.Parse(DropDownList1.SelectedValue));
        }
    }
    public event EventHandler SelectedClassChange
    {
        add { DropDownList1.SelectedIndexChanged += value; }
        remove { DropDownList1.SelectedIndexChanged -= value; }
    }
}